Method for preparing electrically fused recombined magnesite-chrome brick

Abstract

This invention belongs to the field of refractory brick production technology, specifically a method for preparing electrofused magnesia-chrome bricks. Addressing the problems of high sintering temperatures leading to brick cracking and high energy consumption in existing technologies, the following solution is proposed, including the following steps: High-purity magnesia, electrofused magnesia with a large crystalline structure, electrofused magnesia-chrome sand, ultrafine powder, and rare earth sintering agent are added to a mixing mill for mixing; molding is then performed by feeding the mixed raw materials into a friction brick machine for molding; the molded brick blanks are then dried at a temperature set between 110-200℃ for 48 hours. This invention lowers the firing temperature of magnesia-chrome bricks by adding rare earth sintering agent and using ultrafine powder, achieving better firing results at a lower firing temperature and reducing energy consumption; by adding a certain amount of rare earth sintering agent, a certain amount of uniform micropores are generated during firing, improving the thermal shock resistance of the magnesia-chrome bricks.

Description

Technical Field

[0001] This invention relates to the field of refractory brick production technology, and in particular to a method for preparing electrofused rebonded magnesia-chrome bricks. Background Technology

[0002] With increasing environmental awareness and continuous advancements in industrial technology, calcareous alkaline refractory materials have gained widespread application in building materials, metallurgical smelting, and other industries due to their environmentally friendly properties and ability to purify molten steel. Magnesia-calcium bricks are alkaline composite refractory products with MgO and CaO as their main chemical components. Magnesia-calcium bricks possess excellent performance characteristics, especially in purifying molten steel.

[0003] According to research, existing technologies for producing durable bricks do not employ low-temperature sintering, often resulting in brick cracking due to high-temperature sintering. Furthermore, higher sintering temperatures lead to higher energy consumption, longer cooling times, and lower production efficiency. Summary of the Invention

[0004] To overcome the above-mentioned shortcomings in the prior art, the present invention provides a novel method for preparing electrofused reconstituted magnesia-chrome bricks that can reduce the sintering temperature by adding ultrafine powder:

[0005] This invention provides a method for preparing electrofused rebonded magnesia-chrome bricks, comprising the following steps:

[0006] Step 1: Ingredient preparation, including high-purity magnesia, fused magnesia with a large crystal structure, and fused magnesia-chromium sand. The ultrafine powder and rare earth sintering agent are added to the mixer and mixed.

[0007] Step 2: Molding. The mixed raw materials are put into the friction brick machine for molding. After molding, the brick blanks are dried. The drying temperature is set between 110-200℃ and the drying time lasts for 48 hours.

[0008] Step 3: Sintering. The dried brick blanks are sent into a tunnel kiln for sintering. During the sintering process, the temperature inside the tunnel kiln is controlled between 1680-1700℃ and the sintering time is 5 hours. After that, they are taken out and cooled in the air.

[0009] Step 4: Salt soaking and drying. The sintered bricks are sent to a salt soaking and drying machine for salt soaking and drying.

[0010] Preferably, the proportions of each component in step one are as follows:

[0011] High-purity magnesia: 5-25 parts;

[0012] Large-crystal fused magnesia: 20-40 parts;

[0013] 30-40 parts of fused magnesia-chromium sand;

[0014] Chromite: 5-16 parts;

[0015] 2-8 servings;

[0016] Ultrafine powder: 2-10 parts;

[0017] Rare earth sintering agent: 0.1-1 part;

[0018] The particle size of the ultrafine powder is 1-5 μm;

[0019] Rare earth sintering agent: 0.2-0.5 parts.

[0020] Preferably, the salt-drying machine in step four includes a base plate. A crescent-shaped brine pool with an upward-opening structure is embedded in the center of one end of the base plate. An inclined suspension is fixed to the upper surface of the base plate near the brine pool. A bearing seat is fixed to the top of the inclined suspension, and a tilted fixing frame with an inclined plate surface is rotatably connected to the lower surface of the bearing seat. Both ends of the tilted fixing frame are provided with a vertically suspended hanging pipe (first and second). A spiral storage rack is fitted and fixed to the outer circumference of both hanging pipes, and the upper and lower ends of the spiral storage rack are respectively connected to... The base plate has horizontally extending feeding and discharging trays; a drying mechanism is provided at the end of the base plate away from the brine tank, and the drying mechanism includes an arched frame fixed to the base plate. The top of the arched frame is rotatably connected to two mutually symmetrical spokes. The ends of the two spokes away from their rotation axis are respectively fixed with half-bucket one and half-bucket two, which can be combined into a cylindrical barrel. An air inlet pipe is inserted into the outer circumference of half-bucket two near the bottom end to introduce hot air generated during sintering or to provide a separate hot air flow. Half-bucket one and half-bucket two are respectively opened with boxes that are adapted to the feeding tray and the discharging tray.

[0021] Preferably, anti-detachment bearings are respectively installed at the upper and lower ends of the bearing seat one, and a transmission rod is rotatably connected in the anti-detachment bearing. The upper surface of the inclined fixing frame is fixed to the bottom end of the transmission rod. A bevel gear is fixed to the top end of the transmission rod, and a self-locking motor is fixed to the top end of the inclined suspension near the bearing seat. The output shaft of the self-locking motor is fixed to the top end of the drive gear that meshes with the bevel gear. A shaft sleeve is fixed to both ends of the upper surface of the inclined fixing frame, and U-shaped fork seats with opposite openings are fixed to both ends of the inclined fixing frame. A rotating shaft is fixed to the end of each of the two U-shaped fork seats near the inclined fixing frame. The rotating shaft is aligned with the length direction of the inclined fixing frame. An anti-detachment bearing seat is rotatably connected to the middle of each of the two U-shaped fork seats, and coaxial horizontal shafts are provided on both the front and rear sides of the anti-detachment bearing seat. Through the horizontal shafts and rotating shafts, it can be ensured that the inclined fixing frame keeps the first and second hanging pipes in a vertical state when it is rotated, which can prevent the bricks on the spiral storage rack from slipping.

[0022] Preferably, each of the two half-buckets has an arc-shaped notch near its top on one side that matches the outer diameter of the first hanging pipe, and the bottom inner wall of each of the two half-buckets has a semi-ring for fixing the first hanging pipe. Through the arc-shaped notch and semi-ring, the spiral storage rack to be loaded or unloaded can be fixed between the two half-buckets to prevent the spiral storage rack from shaking.

[0023] Preferably, the inner circumferential walls of half-bucket one and half-bucket two are slidably connected with arc-shaped inserts near the top of their respective doors, and the tops of the two arc-shaped inserts are fixed with hanging rods. The tops of half-bucket one and half-bucket two are fixed with electrically controlled positioning pins near the corresponding hanging rods, and the tops of the two electrically controlled positioning pins are fixed with connecting plates between the tops of the two electrically controlled positioning pins and the tops of the corresponding hanging rods. When drying is required, the extension rods of the two electrically controlled positioning pins are retracted, and the two arc-shaped inserts are lifted at the same time, that is, the doors are opened.

[0024] Preferably, two vertical drive shafts are rotatably connected to the top of the bow-shaped frame near the center, and the tops of the two drive shafts are fixed to the ends of two spoke rods respectively. The bottom ends of the two drive shafts are respectively fixed with the same gear, and the two gears are meshed with the same rack rod. An L-shaped suspension is fixed to the side of the bow-shaped frame, and an electric push rod is fixed to the end of the L-shaped suspension. The end of the electric push rod extension is fixed to the end of the rack rod. By setting a rack rod that meshes with the two gears simultaneously, the half-bucket one and half-bucket two can be quickly combined and separated to a position away from the spiral storage rack, while maintaining synchronous operation and precise combination.

[0025] Preferably, a hot air blower is fixed on the side of the bow-shaped frame near the air inlet pipe, and the air outlet of the hot air blower is connected to the air inlet of the air inlet pipe for heat storage during loading and unloading.

[0026] Preferably, the upper surface of the base plate is provided with a slag discharge hole near the bottom of the assembled half-bucket one and half-bucket two to discharge some debris during the feeding and unloading process. The bow-shaped frame is provided with two feeding conveyor belts and a discharging conveyor belt that correspond to the positions of the two assembled box doors respectively.

[0027] Preferably, the upper surface of the spiral storage rack is provided with a spiral slide, and a material distribution rib is provided in the middle of the spiral slide, which can arrange multiple groups of bricks for advancement at the same time, thereby improving the loading and unloading efficiency.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. By adding rare earth sintering agents and using ultrafine powder, the firing temperature of magnesia-chrome bricks is lowered, allowing them to achieve better firing results at a lower firing temperature and reducing energy consumption; by adding a certain amount of This process generates a certain amount of uniform micropores in the magnesia-chrome bricks during firing, thereby improving their thermal shock resistance.

[0030] 2. With the set spiral storage rack and inclined fixing rack, the sintered bricks can be directly pushed inward along the feeding tray during salt soaking. After the spiral storage rack is full, it is rotated 180° around the bearing seat to enter the brine pool for soaking. At the same time, another spiral storage rack can be fed. After soaking, it is rotated out to the feeding position for drying. After drying, the dried bricks are squeezed out while feeding. This process does not require personnel to approach and operate, which greatly reduces labor intensity.

[0031] 3. By setting a rack and pinion rod that meshes with two gears simultaneously, half-bucket one and half-bucket two can be quickly combined and separated to a position away from the spiral storage rack, while maintaining synchronous operation and precise combination. With the auxiliary loading and unloading devices on both sides of the box door, loading and unloading can be carried out simultaneously, improving production efficiency and increasing the unmanned rate of the factory area. Attached Figure Description

[0032] Figure 1 This is a flowchart of the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of the salt immersion dryer in this invention;

[0034] Figure 3 This is a side view of the salt immersion dryer in this invention;

[0035] Figure 4 The salt leaching dryer of this invention Figure 3 Schematic diagram of the cross-sectional structure along line AA;

[0036] Figure 5 This is a schematic diagram of the structure of the salt immersion dryer in this invention during the repositioning process;

[0037] Figure 6 This is a schematic diagram of the structure of half-barrel one and half-barrel two in the salt leaching dryer of the present invention when they are opened;

[0038] Figure 7 This is a half-sectional three-dimensional structural diagram of the brine tank in the salt leaching dryer of the present invention;

[0039] Figure 8 This is a schematic diagram of the spiral storage rack in the salt leaching dryer of the present invention.

[0040] In the diagram: 1. Base plate; 2. Inclined suspension; 3. Self-locking motor; 4. Bevel gear; 5. Bearing seat one; 6. Inclined fixing frame; 7. U-shaped fork seat; 8. Anti-detachment bearing seat; 9. Hanging pipe one; 10. Half-barrel one; 11. Feeding conveyor belt; 12. Discharge conveyor belt; 13. Bow-shaped frame; 14. Air inlet pipe; 15. Brine tank; 16. Hanging pipe two; 17. Hot air blower; 18. Electric push rod; 19. Arc-shaped insert plate; 20. Transmission rod; 21. Spoke rod; 22. Half-barrel two; 23. Electrically controlled positioning pin; 24. Gear; 25. Rack and pinion rod; 26. Semi-ring; 27. Spiral storage rack; 271. Feeding tray; 272. Discharge tray; 273. Material distribution rib. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] In this embodiment, refer to Figure 1 A method for preparing electrofused rebonded magnesia-chrome bricks includes the following steps:

[0043] Step 1: Ingredient preparation, including high-purity magnesia, fused magnesia with a large crystal structure, and fused magnesia-chromium sand. The ultrafine powder and rare earth sintering agent are added to the mixer and mixed.

[0044] Step 2: Molding. The mixed raw materials are put into the friction brick machine for molding. After molding, the brick blanks are dried. The drying temperature is set between 110-200℃ and the drying time lasts for 48 hours.

[0045] Step 3: Sintering. The dried brick blanks are sent into a tunnel kiln for sintering. During the sintering process, the temperature inside the tunnel kiln is controlled between 1680-1700℃ and the sintering time is 5 hours. After that, they are taken out and cooled in the air.

[0046] Step 4: Salt soaking and drying. The sintered bricks are sent to a salt soaking and drying machine for salt soaking and drying.

[0047] In this invention, the specific proportions of each component in step one are as follows:

[0048] High-purity magnesia: 5-25 parts;

[0049] Large-crystal fused magnesia: 20-40 parts;

[0050] 30-40 parts of fused magnesia-chromium sand;

[0051] Chromite: 5-16 parts;

[0052] 2-8 servings;

[0053] Ultrafine powder: 2-10 parts;

[0054] Rare earth sintering agent: 0.1-1 part;

[0055] The particle size of the ultrafine powder is 1-5 μm;

[0056] Rare earth sintering agent: 0.2-0.5 parts.

[0057] Please refer to Figures 2-8 In step four, the salt-drying machine includes a base plate 1. A crescent-shaped brine pool 15 with an upward-opening structure is embedded in the center of one end of the base plate 1. An inclined suspension 2 is fixed to the upper surface of the base plate 1 near the brine pool 15. A bearing seat 5 is fixed to the top of the inclined suspension 2, and an inclined fixing frame 6 with an inclined surface is rotatably connected to the lower surface of the bearing seat 5. Both ends of the inclined fixing frame 6 are equipped with vertically suspended hanging pipes 9 and 16. A spiral storage rack 27 is fitted and fixed to the outer circumference of both hanging pipes 9 and 16. The upper and lower ends of the spiral storage rack 27 are respectively connected to a horizontally extending feeding tray 271 and a discharging tray 272. A drying mechanism is provided at the end of the base plate 1 away from the brine pool 15. The drying mechanism includes an arc-shaped frame 13 fixed to the base plate 1. Two symmetrical spokes 21 are rotatably connected to the top of the arc-shaped frame 13. Half-bucket 10 and half-bucket 22, which can be used to form a cylindrical barrel, are fixed at one end of the rotating shaft. The outer circumference of half-bucket 22 is connected to the bottom end with an air inlet pipe 14 to introduce the hot air generated during sintering or to provide a separate hot air flow. Half-bucket 10 and half-bucket 22 are respectively opened with boxes that are compatible with the feeding tray 271 and the discharging tray 272. Through the set spiral storage rack 27 and inclined fixing frame 6, the sintered bricks can be directly pushed inward along the feeding tray 271 during salt soaking. After the spiral storage rack 27 is full, it is rotated 180° around the bearing seat 5 to reach the brine pool 15 for soaking. At the same time, the other spiral storage rack 27 can be fed. After soaking, it is rotated out to the feeding position for drying. After drying, the dried bricks are squeezed out while feeding. This process does not require personnel to approach and operate, which greatly reduces labor intensity.

[0058] Please refer to Figure 4 and Figure 5Anti-detachment bearings are respectively installed at the upper and lower ends of bearing housing 5. A transmission rod 20 is rotatably connected to the anti-detachment bearing. The middle of the upper surface of the inclined fixing frame 6 is fixed to the bottom end of the transmission rod 20. A bevel gear 4 is fixed to the top of the transmission rod 20. A self-locking motor 3 is fixed to the top of the inclined suspension 2 near bearing housing 5. The top of the output shaft of the self-locking motor 3 is fixed with a drive gear that meshes with the bevel gear 4. Shaft sleeves are fixed at both ends of the upper surface of the inclined fixing frame 6, and open shaft sleeves are fixed at both ends of the inclined fixing frame 6. The U-shaped fork seats 7 are arranged in opposite directions. Each of the two U-shaped fork seats 7 has a rotating shaft fixed at one end near the inclined fixing frame 6. The rotating shaft is aligned with the length direction of the inclined fixing frame 6. The middle of each of the two U-shaped fork seats 7 is rotatably connected to an anti-detachment bearing seat 8. The anti-detachment bearing seat 8 has a coaxial horizontal shaft on both the front and rear sides. Through the horizontal shaft and the rotating shaft, it can be ensured that the inclined fixing frame 6 keeps the first hanging pipe 9 and the second hanging pipe 16 in a vertical state when it is rotated, which can prevent the bricks on the spiral storage rack 27 from slipping.

[0059] Please refer to Figure 6 On the opposite side of half-barrel 10 and half-barrel 22, near the top, there are arc-shaped notches that are compatible with the outer diameter of the hanging pipe 9. The bottom inner walls of half-barrel 10 and half-barrel 22 are reserved for fixing the hanging pipe 9. Through the arc-shaped notches and half-rings 26, the spiral storage rack 27 to be loaded or unloaded can be fixed between half-barrel 10 and half-barrel 22 to prevent the spiral storage rack 27 from shaking.

[0060] Please refer to Figure 4 and Figure 6 Both half-barrel 10 and half-barrel 22 have slidably connected arc-shaped insert plates 19 near the top of their respective doors on their inner circumference. The top of each arc-shaped insert plate 19 is fixed with a hanging rod. The top of each half-barrel 10 and half-barrel 22 is fixed with an electrically controlled positioning pin 23 near the corresponding hanging rod. The top of each electrically controlled positioning pin 23 is fixed with a connecting plate between the top of the two electrically controlled positioning pins 23 and the top of the corresponding hanging rod. When drying is required, the extension rods of the two electrically controlled positioning pins 23 are retracted, and the two arc-shaped insert plates 19 are lifted at the same time, that is, the door is opened.

[0061] Please refer to Figures 4-6Two vertical drive shafts are rotatably connected to the top of the bow-shaped frame 13 near the center, and the tops of the two drive shafts are fixed to the ends of the two spoke rods 21. The bottom ends of the two drive rods are respectively fixed with the same gear 24, and the two gears 24 are meshed with the same rack rod 25. An L-shaped suspension is fixed to the side of the bow-shaped frame 13, and an electric push rod 18 is fixed to the end of the L-shaped suspension. The end of the extension rod of the electric push rod 18 is fixed to the end of the rack rod 25. By setting the rack rod 25 that meshes with the two gears 24 at the same time, the half-bucket 10 and the half-bucket 22 can be quickly combined and separated to a position away from the spiral storage rack 27, while maintaining synchronous operation and precise combination.

[0062] Please refer to Figure 2 and Figure 3 A hot air blower 17 is also fixed on the side of the bow-shaped frame 13 near the air inlet pipe 14, and the air outlet of the hot air blower 17 is connected to the air inlet of the air inlet pipe 14 to store heat during loading and unloading.

[0063] Please refer to Figure 2 and Figure 6 The upper surface of the base plate 1 is provided with a slag discharge hole near the bottom of the assembled half-bucket 10 and half-bucket 22 to discharge some debris during the feeding and unloading process. The bow-shaped frame 13 is provided with two feeding conveyor belts 11 and discharge conveyor belts 12, which correspond to the positions of the two assembled box doors respectively.

[0064] Please refer to Figure 8 The upper surface of the spiral storage rack 27 is provided with a spiral slide, and a material distribution rib 273 is provided in the middle of the spiral slide, which can arrange multiple groups of bricks for advancement at the same time, thereby improving the efficiency of loading and unloading.

[0065] Working principle: When using this device, firstly, the inclined fixing frame 6 is rotated to a position where one end is higher than the other. Then, the extension rod of the electric push rod 18 is extended to drive half-bucket 10 and half-bucket 22 to assemble, thereby clamping and fixing the spiral storage rack 27 at the higher end. After the feeding conveyor belt 11 and the discharging conveyor belt 12 are aligned with their respective boxes, the material can be loaded. At this time, the cooled bricks to be salted are pushed into the spiral slide of the spiral storage rack 27 and arranged closely, until the first brick... The body slides to the lowest end, then opens half-bucket 10 and half-bucket 22, and controls the self-locking motor 3 to run, transferring the spiral storage rack 27 carrying the bricks to the deepest position in the middle of the brine pool 15 for soaking. The other end continues to feed material using the previous method. After the salt soaking is completed, it rotates to the highest end, controls half-bucket 10 and half-bucket 22 to combine, and introduces high-temperature gas for drying. Then, it continues to feed material to squeeze the salt-soaked and dried bricks out from the lower box door and transport them away from the lower discharge conveyor belt 12.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing electrofused rebonded magnesia-chrome bricks, comprising the following steps: Step one: ingredients, high-purity magnesite, electric melting magnesite with large crystal structure, electric melting magnesite-chrome sand, , ultrafine powder and rare earth sintering agent are added to the mixing mill; Step 2: Molding. The mixed raw materials are put into the friction brick machine for molding. After molding, the brick blanks are dried. The drying temperature is set between 110-200℃ and the drying time lasts for 48 hours. Step 3: Sintering. The dried brick blanks are sent into a tunnel kiln for sintering. During the sintering process, the temperature inside the tunnel kiln is controlled between 1680-1700℃ and the sintering time is 5 hours. After that, they are taken out and cooled in the air. Step 4: Salt soaking and drying. The sintered bricks are sent to a salt soaking and drying machine for salt soaking and drying.

2. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 1, characterized in that, The specific proportions of each component in step one are as follows: High-purity magnesia: 5-25 parts; Large-crystal fused magnesia: 20-40 parts; 30-40 parts of fused magnesia-chromium sand; Chromite: 5-16 parts; 2-8 servings; Ultrafine powder: 2-10 parts; Rare earth sintering agent: 0.1-1 part; The particle size of the ultrafine powder is 1-5 μm; Rare earth sintering agent: 0.2-0.5 parts.

3. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 1, characterized in that, The salt leaching dryer in step four includes a base plate (1). A crescent-shaped brine pool (15) with an upward opening is embedded in the middle of one end of the base plate (1). An inclined suspension (2) is fixed to the upper surface of the base plate (1) near the brine pool (15). A bearing seat (5) is fixed to the top of the inclined suspension (2). An inclined fixing frame (6) with an inclined plate surface is rotatably connected to the lower surface of the bearing seat (5). Both ends of the inclined fixing frame (6) are provided with a hanging pipe (9) and a hanging pipe (16) that are always vertically suspended. A spiral storage rack (27) is sleeved and fixed to the outer circumference of the hanging pipe (9) and the hanging pipe (16). The upper and lower ends of the spiral storage rack (27) are respectively connected to a feeding device that extends horizontally outward. The base plate (1) is equipped with a drying mechanism at one end away from the brine tank (15), and the drying mechanism includes an arc frame (13) fixed on the base plate (1). The top of the arc frame (13) is rotatably connected to two mutually symmetrical spoke rods (21). The ends of the two spoke rods (21) away from their rotation axis are respectively fixed with half barrel one (10) and half barrel two (22) that can be combined into a cylindrical barrel. The outer circumference of half barrel two (22) is connected to an air inlet pipe (14) near the bottom end for passing in hot air generated during sintering or providing hot air flow separately. Half barrel one (10) and half barrel two (22) are respectively opened with boxes that are compatible with the loading tray (271) and the discharging tray (272).

4. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 3, characterized in that, The upper and lower ends of the bearing seat (5) are respectively fitted with anti-detachment bearings, and the anti-detachment bearings are rotatably connected to the transmission rod (20). The upper surface of the inclined fixing frame (6) is fixed to the bottom end of the transmission rod (20). The top end of the transmission rod (20) is fixed with a bevel gear (4), and the top end of the inclined suspension (2) is fixed with a self-locking motor (3) near the bearing seat (5). The top end of the output shaft of the self-locking motor (3) is fixed with a drive gear that meshes with the bevel gear (4). The upper surface of the inclined fixing frame (6) is fixed with shaft sleeves at both ends, and the two ends of the inclined fixing frame (6) are respectively fixed with U-shaped fork seats (7) with opposite openings. The two U-shaped fork seats (7) are fixed with a rotating shaft bar at one end near the inclined fixing frame (6). The rotating shaft bar is in the same direction as the length of the inclined fixing frame (6). The middle of the two U-shaped fork seats (7) is rotatably connected with an anti-detachment bearing seat (8), and the front and rear sides of the anti-detachment bearing seat (8) are provided with coaxial horizontal shafts.

5. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 4, characterized in that, The two half-buckets (10) and (22) have arc-shaped notches near the top on opposite sides that are compatible with the outer diameter of the hanging pipe (9). The bottom inner walls of the two half-buckets (10) and (22) also have semi-rings (26) for fixing the hanging pipe (9).

6. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 5, characterized in that, The inner circumference of half-bucket one (10) and half-bucket two (22) are slidably connected with arc-shaped insert plates (19) near the top of their respective doors, and the top of the two arc-shaped insert plates (19) is fixed with a hanging rod. The top of the half-bucket one (10) and half-bucket two (22) is fixed with an electric control positioning pin (23) near the corresponding hanging rod, and the top of the two electric control positioning pins (23) is fixed with a connecting plate between the top of the two electric control positioning pins (23) and the top of the corresponding hanging rod.

7. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 6, characterized in that, Two vertical drive shafts are rotatably connected to the top of the bow-shaped frame (13) near the middle, and the tops of the two drive shafts are fixed to the ends of the two spoke rods (21). The bottom ends of the two drive rods are respectively fixed with the same gear (24), and the two gears (24) are meshed with the same rack rod (25). An L-shaped suspension is fixed to the side of the bow-shaped frame (13), and an electric push rod (18) is fixed to the end of the L-shaped suspension. The end of the extension rod of the electric push rod (18) is fixed to the end of the rack rod (25).

8. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 7, characterized in that, A hot air blower (17) is also fixed on the side of the bow-shaped frame (13) near the air inlet pipe (14), and the air outlet of the hot air blower (17) is connected to the air inlet of the air inlet pipe (14).

9. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 8, characterized in that, The upper surface of the base plate (1) is provided with a slag discharge hole near the bottom of the combined half barrel one (10) and half barrel two (22) to discharge some debris during the feeding and unloading process. The bow-shaped frame (13) is provided with two feeding conveyor belts (11) and discharge conveyor belts (12) respectively corresponding to the positions of the two combined box doors.

10. The method for preparing an electrofused rebonded magnesia-chrome brick according to claim 9, characterized in that, The upper surface of the spiral storage rack (27) is provided with a spiral slide, and a material distribution rib (273) is provided in the middle of the spiral slide.

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